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    NACE MR0175 Hardness Requirement

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    nhirpara1
    NACE MR 0175/ISO 15156 is a materials standard that specifies corrosion resistant alloys that can be used in oilfield equipment where hydrogen sulfide is present. It limits the maximum hardness for materials including various grades of stainless steel. A wide range of alloys are covered, including ferritic, martensitic, austenitic, duplex, and precipitation hardening grades of stainless steel with maximum hardness limits ranging from 22 to 35 on the Rockwell C scale depending on the specific alloy. The standard provides guidance but not specific conversions between hardness scales such as Rockwell B, Vickers, or Brinell, which present issues for measuring softened stainless steel hardness.

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    NACE MR0175 Hardness Requirement

    Uploaded by

    nhirpara1
    850 views1 page
    NACE MR 0175/ISO 15156 is a materials standard that specifies corrosion resistant alloys that can be used in oilfield equipment where hydrogen sulfide is present. It limits the maximum hardness for materials including various grades of stainless steel. A wide range of alloys are covered, including ferritic, martensitic, austenitic, duplex, and precipitation hardening grades of stainless steel with maximum hardness limits ranging from 22 to 35 on the Rockwell C scale depending on the specific alloy. The standard provides guidance but not specific conversions between hardness scales such as Rockwell B, Vickers, or Brinell, which present issues for measuring softened stainless steel hardness.

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    NACE MR0175 Hardness requirement

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    NACE MR 0175/ISO 15156 is a materials standard that specifies corrosion resistant alloys that can be used in oilfield equipment where hydrogen sulfide is present. It limits the maximum hardness for materials including various grades of stainless steel. A wide range of alloys are covered, including ferritic, martensitic, austenitic, duplex, and precipitation hardening grades of stainless steel with maximum hardness limits ranging from 22 to 35 on the Rockwell C scale depending on the specific alloy. The standard provides guidance but not specific conversions between hardness scales such as Rockwell B, Vickers, or Brinell, which present issues for measuring softened stainless steel hardness.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    850 views1 page

    NACE MR0175 Hardness Requirement

    Uploaded by

    nhirpara1
    NACE MR 0175/ISO 15156 is a materials standard that specifies corrosion resistant alloys that can be used in oilfield equipment where hydrogen sulfide is present. It limits the maximum hardness for materials including various grades of stainless steel. A wide range of alloys are covered, including ferritic, martensitic, austenitic, duplex, and precipitation hardening grades of stainless steel with maximum hardness limits ranging from 22 to 35 on the Rockwell C scale depending on the specific alloy. The standard provides guidance but not specific conversions between hardness scales such as Rockwell B, Vickers, or Brinell, which present issues for measuring softened stainless steel hardness.

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    © All Rights Reserved
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    of 1

    NACE MR 0175/ISO 15156 for Corrosion Resistant

    Alloys for Sulphide Service


    Introduction
    NACE MR 0175/ISO 15156 is a Materials Standard issued by the National Association of Corrosion Engineers.
    It is originally a US standard intended to assess the suitability of materials for oilfield equipment where sulphide (sulfide) stress
    corrosion cracking may be a risk in hydrogen sulphide (sour) environments. However, the world standards body ISO has issued it
    under its own "brand". The latest edition includes technical corrigenda from 2005. Discussions about the standard can be found on
    the NACE website.
    The standard specifies the types of corrosion resistant materials including stainless steels that can be used in specific oilfield
    environments and places limits on the hardness of the material. This applies both to parent and weld material. The maximum
    hardness is usually defined in terms of the Rockwell 'C' scale.
    No conversion to other hardness scales is given in MR 0175 which presents one problem as softened stainless steels hardnesses
    are measured using either the Rockwell 'B', Vickers or Brinell scales.
    Approximate conversions are available.
    Summary of MR 0175 Requirements
    A wide range of materials is covered by the standard including most types (families) of stainless steels. The table below shows
    some of these grades. However, this summary is intended to only give a general idea of this complex standard and is not a
    substitute for the original document.

    Grades
    Steel Type Comments
    Included
    405,430, 409, 434, 436, 442, Hardness up to 22 HRC
    Ferritic
    444, 445, 446, 447, 448
    Martensitic 410, 420 Hardness up to 22 HRC
    Martensitic F6NM Hardness up to 23 HRC
    Martensitic S41425 Hardness up to 28 HRC
    201, 202, 302, 304, 304L, Solution annealed, no cold work to enhance properties, hardness
    305, 309, 310, 316, 316L, up to 22 HRC
    317, 321, 347,
    Austenitic
    S31254(254SMO),
    N08904(904L),
    N08926(1925hMo)
    Austenitic S20910 Hardness up to 35 HRC
    S31803 (1.4462), PREN >30 solution annealed condition, ferrite content 35% to
    S32520 (UR 52N+), S32750 65%, or 30 to 70% in welds. Note that the general restriction of 28
    (2507), S32760 (Zeron 100), HRC in previous editions is not found in this latest edition of the
    Duplex
    S32550(Ferralium 255) standard. There is a specific restriction on HIP'd S31803 to
    25HRC. For some applications cold worked material is allowed up
    to 36HRC
    Precipitation 17-4 PH 33 HRC Age hardening at 620 deg C
    Hardening

    Precipitation S45000 31 HRC Age hardening at 620 deg C


    Hardening
    Precipitation S66286 35 HRC
    Hardening
    Free machining grades such as the 303 and 416 types are excluded from of NACE MR 0175/ISO 15156

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